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Commuters wear protective masks as they walk by a billboard showing some of China's Olympic athletes in the subway on August 6, 2021 in Beijing, China. While cases still remain relatively low compared to many countries, China is battling its worst COVID-19 outbreak in months after workers in the arrivals area at Nanjing International Airport were infected with the highly contagious Delta variant and it has since spread to dozens of cities in at least 18 provinces. (Photo by Kevin Frayer/Getty Images)
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